Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606, USA.
Phys Rev E. 2017 Apr;95(4-1):042407. doi: 10.1103/PhysRevE.95.042407. Epub 2017 Apr 24.
The embryonic metabolisms of the ornithischian dinosaurs Protoceratops andrewsi and Hypacrosaurus stebingeri have been determined and are in the range observed in extant reptiles. The average value of the measured embryonic metabolic rates for P. andrewsi and H. stebingeri are then used to calculate the incubation times for 21 dinosaurs from both Sauischia and Ornithischia using a mass growth model based on conservation of energy. The calculated incubation times vary from about 70 days for Archaeopteryx lithographica to about 180 days for Alamosaurus sanjuanensis. Such long incubation times seem unlikely, particularly for the sauropods and large theropods. Incubation times are also predicted with the assumption that the saurischian dinosaurs had embryonic metabolisms in the range observed in extant birds.
兽脚亚目恐龙原角龙和肿头龙的胚胎代谢已经确定，其范围与现生爬行动物的观察结果一致。然后，使用基于能量守恒的质量增长模型，将测量的原角龙和肿头龙胚胎代谢率的平均值用于计算来自蜥脚形亚目和鸟脚亚目的 21 种恐龙的孵化时间。计算出的孵化时间从始祖鸟的约 70 天到阿根廷龙的约 180 天不等。这样长的孵化时间似乎不太可能，特别是对于蜥脚类恐龙和大型兽脚类恐龙而言。如果假设兽脚亚目恐龙的胚胎代谢处于现生鸟类的观察范围内，也可以预测孵化时间。
